Disk holding device



l. E. SIQVELAND DISK HOLDING DEVICE March 10, 1942.

Filed July 8, 1941 2 Sheets-Sheet l WW@ m. .W- W M uw 7J B ATTORNEYMarch 10, 1942. E, 5|QVELAND- DISK HOLDING DEVICE Filed July e, 1941 2Sheets-Sheet 2 lum/UE Smwfzfeamd BY nl. @un '/l/ nlnf ATTORNEY PatentedMar. 10, 1942 UNTED S'lflllSy PATENT OFFICE 12 Claims.

My invention relates to an improvement in a disk holding device whereinit is desired to provide a device for facilitating the changing of sandpaper disks, and the like, used in dentistry.

For many purposes in dentistry various types and classes of abrasivedisks are used. These disks are secured to the end of the hand piece orcontra angle and are rotated by the dental engine in the usual way forgrinding and polishing purposes. It has been common practice to insert ascrew or bolt through a central opening in the disk and to screw thisbolt into a suitable disk support by rotation of the support by thedental engine. Other types of disk holding means have also beenprovided, but the bolt has been most commonly used because of itssimplicity.

It is the object of the present invention to provide a disk holdingdevice which will support an abrasive disk, or the like, and which willpermit changing or replacing of the disks in an extremely simple andeffective manner. In applying the disk, it is only necessary to placethe disk against the end of the holder and to rotate the dental engine,the disk threading its way onto the holder when the disk is in place. Itis only necessary to grasp a portion of the holder, whereupon the diskis rmly secured in place.

It is a feature of the present invention to provide a disk holdingdevice which embodies the use of a spiral spring upon which the disk isthreaded. When the disk has been threaded into operative position, thecenter of the spiral spring is pulled into alignment or substantialalignment with the outer convolutions of the spring, making a at spiral,rather than a conical-shaped spring. When in this iiat relation, thespring acts to hold the disk firmly in place and to prevent rota titonof the disk with respect to the holder.

A feature of my invention lies in the simplicity of the disk holder. Thecomplete holder comprises nothing more than a spiral conical-shapedspring, a shank for supporting the spring and a nut threadable on thesupporting shank. Through the use of these three elements a disk holdermay be formed which will permit extremely fast changing of the disks.

A further feature of my invention lies in the provision of a spiralspring which is substantially conical-shaped and which is provided witha central connecting member by means of which the center of the springmay be pulled downwardly until all of the convolutions of the spring arein substantially the same plane. This central connecting member maybeeither a portion of one end of the spring or may be a separate member towhich the upper end of the spring may be attached.

A feature of my invention resides in the fact that disks of the mostinexpensive type may be securely held by my disk holder and' that nospecial disks are required for use in conjunction with the holder. As aresult, the disks which are designed for use with the most common typeof disk holding means may be used with the present construction and thatthere is no necessity of changing the style of disks which must be'used.

These and other objects and novel features of my invention will be moreclearly and fullyA set forth in the following specication and claims.

In the drawings forming a part of my specification:

Figure 1 is a perspective View of the end of a hand set showing my diskholder holding the disk in place thereupon.

Figure 2 is a cross-sectional view through the disk holder illustratingthe construction thereof, in enlarged form.

Figure 3 is an outside elevation view of the disk holding device ingreatly enlarged form.

Figure 4 is a View similar to Figure 2, showing the disk holder inposition to support a disk.

Figure 5 is a cross-sectional view similar to Figure 2 illustrating aslightly modied form of construction.

Figure 6 is a sectional view similar to Figure 4 showing the modied formof construction in disk holding position.

Figure '7 is a greatly enlarged perspective view of the spring used inconjunction with the holder.

Figure 8 isa sectional view similar to Figure 2 showinganother modifiedform of disk holder construction.

Figure 9 is a sectional view similar to Figure 8, but showinglthe diskholder in disk holding position.

Figure 10 is a sectional view through the nut or threaded sleeve withinwhich the disk holder operates.

Figure 11 is a view of the shank of the holder in greatly enlarged form.

Figure 12 is a perspective view of the spring l used in conjunction withthe disk holder of views 8 and 9.

The disk holder A illustrated in Figures 1 through 4 of the drawingscomprises a hollow shanky I Il having external threads I I thereupon atone end thereof. The shank I0 is threaded into a nut or sleeve I2 whichis formed in two parts.

The major part I3 of the nut or sleeve I2 is internallyv threaded toengage the external threads of the shank I0. The tip portion I4 isprovided with a hollow threaded sleeve I5 integral therewith which alsothreads into the internal threads of the major portion I3 of the nuta orsleeve I2. An opening or passageway I6 extends through the sleeve ornipple I5 and thorough the entire tip portion I4, this bore I6 being inalignment with the bore II of the shank I0.

A spiral conically-shaped spring I9 projects bef yond the tip I4 of thesleeve I2. This spring I9 has a relatively large spring convolution atthe base of the spring and has successively smaller diameterconvolutions as the spring progresses toward its upper tip end 201. Thetip end 20 is connected by a connecting member 2| to the shank ID. Inthe construction illustrated the connecting member 2| extends from thetip end 26 through the aligned bores I6 and I I and is bent over the endof the shank I0, as illustrated at 22, tting into a groove in the shankI and being securely soldered or welded in place. The large diameter end23 of the spring I9 is connected by a connecting wire 24 which extendsthrough the bore I6, together with the connecting member 2| and isanchored within the tip I4. The anchor may be in the form of a loop 25formed of the spring wire and resting freely against the end of theprojecting sleeve or nipple I5. It is essential that the anchoring loop25 rotate with respect to the nipple in operation of the device.

In operating the disk holder, the diskv B is placed against the tip end20 of the holder so that the central opening 26 therein accommodates thetip end 20. The entire tip end is rotated by the dental engine, theshank I0 being supported in a suitable chuck or other holding device.Rotation of the holder A, while the disk B is held stationary causes thespring wire I0 to thread itself into the opening 26-of the disk B untilthe disk rests against the end surface 2'I of the sleeve I2.

In order to clamp the disk in place, the sleeve I2 isnext held fromrotation while the shank I0 continued its rotation. 'I'his causes vtheshank I0 to be threaded outwardly in the sleeve I2 and causes theconnecting member 2| to be drawn toward the surface 2'I of the sleeve.This forces the spring I9 to assume a flat position upon the surface ofthe disk. The convolution of the spring is positioned in a substantiallyat plane. When in this position, the disk B may be used for itsprescribed purpose.

When it is desired to change disks, it is only necessary to reverse thedirection of rotation of the dental engine and to engage the sleeve I2with the ngers for a short period of time until the spring I9 assumesits natural position as illustrated in Figure 3 of the drawings. Thedisk B is then engaged with the ngers and the continued rotation of theholder causes the disk to be threaded oil ofthe spring I9.

It will be noted that as the spring I 9 is formed of relatively thinspring wire the hole 26 does not increase substantially in size byinsertion of the spring. As the disk moves to place, the spring I9fleXes toward the central -connecting member 2|, thus .preventing thetearing of the disk.

a slightly dilerent form of construction of disk holder. Thisconstruction is very similar to that previously described, but somediierences exist. In the construction illustrated in Figures and 6, ashank 29 is provided which is hollow and has an axial bore 30 extendingtherethrough. The shank 29 is externally threaded at 3|. A nut or sleeve32 is internally threaded to accommodate the shnk 29. The threadspreferably do not extend entirely through the nut or sleeve 32, in orderto limit pivotal movement of the shank in one direction. A smoothnon-threaded portion 33 is shown within the nut or sleeve 32 in theupper extremity thereof. The shank 29 In Figures 5 and 6 of thedrawings, I disclose v is preferably provided with a non-threaded upperextremity 34 -which extends through the unthreaded portion 33 of thesleeve 32.

A spiral conically-sha-ped spring 35 is secured to overlie the endsurface 36 ofthe sleeve 32. This spring 35 has at its lower end 31,relatively large convolutions which are coiled successively smaller indiameter until they reach the top peak end 39. This top peak end 39 isdesigned to extend through the central opening 26 of the disk B and .byholding the disk while the spring 35 rotates in one direction, the diskmay be threaded onto the spring until it rests on the surface 36.Rotation of the spring 35 in the opposite direction, while the disk B isheld stationary, causes this disk to be unthreaded from the spring 35.

In order to insure the centering of the disk B with respect to theholder B, the aperture 26 is adapted to permit the unthreaded end 34fofthe shank 29 to extend therethrough. Thus, when the disk B is in placein the dotted outline position of Figure 5 of the drawings, this disk isheld centered by the unthreaded end 34 of the shank29.

In order to clamp the disk B, the nut or sleeve 32 is held stationaryfor al short period oftime while the shank 29 continues rotation, theshank threading its way partially out of the sleeve 32 and pulling thecenter of the spring 35 downwardly until the various convolutions of thespring are in the same plane. The peak end 39 of the spring 35 isconnected yby a connecting member '40 to the shank 29, the end of theconnecting member 4I) fbeing illustrated at 4I, as Fbent over the end ofthe shank 29 and extending in a groove therein. This end 4I ispreferably soldered or welded in place. The large diameter end 3'I'ofthespringv 35is secured toa connecting member 42 which extends throughthe bore 30 of the shank 29 and projects beyond the end of the shank. Ananchoring tip 43 is secured to the end of the connecting member 42 and aspring 44 encircles the connecting member 42 between the anchoring end43 and the extreme rend of the shank 29.

In Figures 8 and 9 of the drawings, I disclose a holder Dwhich differsinsome respects from the previously described holders. The disk holder Dincludes a shank 45 which is provided with a threaded Iportion 46, anunthreaded portion 41, and av projecting tip portion 49'. A shoulder 50may, if desired, encircle the shank 45 between the lower portion of theshank and'ithethreaded portion 46 to limit rotation of thel shankin onedirection.

A nut or threaded sleeve 5| is internally threaded at 52 to accommodatethe threads 46 of the shank 45. An upper unthreaded portion 53 isprovided to accommodate the unthreaded portion 4'I of the shank 45. Theunthreadedportion 53 is connected .by a relatively Isma'lldiameterpassage 54 or through the sleeve orring 58 threaded into the sleeve 5Iproviding a shoulder 55 at the end of the unthreaded portion.53 betweenthis portion and the smaller diameter passage 54. The tip end 49 of theshank l4:''is designed to extend through this small diameter passage 54with plenty of play.

Upon the end surfacev 56 of the nut or sleeve 5I, I provide a spring 51.The large diameter portion 59 of the spring 5'If-rests upon thesurf-ace56 and the convolutions of the spring are of successivelysmalleridiameter toward the upper spring end 60. 'I'his upper springend60 is designed to extend through a tiny opening 6| in the tip end 49 ofthe shank 45. The large diameter end l59 is connected by a shortconnecting portion 62 to a spring convolution 63 which is designed toengage inwardly of the shoulder 55.

This construction is provided in order to produce a disk holder in whichthe springs may be readily changed. It is obvious with this constructionthat if the spring l should break, it may be removed by withdrawing thetip end 60 from engagement with the hole 6I and by withdrawing thespring convolutions or loop 63 from engagement with the shoulder 55. Theloop or convolution 63 may be threaded through the small diameterpassage 54 of the bushing or ring 58, and this ring 58 screwed intoplace. When the convolution 63 is in place, the shank 45 may be insertedand the tip end 6D secured in place.

In accordance with the patent statutes, I have described the principlesof construction and operation of my disk holder, and while I haveendeavored to set forth the best embodiments thereof, I desire to haveit understood that these are only illustrative of a means of carryingout my invention and that obvious changes may be made within the scopeof the following claims without departing from the spirit of myinvention.

I claim:

1. A disk holder comprising a threaded shank adapted to be supported ina dental hand piece, a substantially conically shaped spiral springprojecting from said shank, and nut means threadably engaged on saidshank, said spring designed to threadably engage into an abrasive disk,and said nut operable on said shaft to compre'ss said spring into asubstantially flat plane' to clamp said disk against said nut.

2. A disk holder comprising a substantially conical spiral spring, meansfor rotatably supporting said spring to thread or unthread itself intoor out of a disk, and means for compressing the convolutions of saidspring into a substantially nat plane to clamp said disk.

3. A clamping device in combination with an element to be clamped havingan opening therethrough, the clamping device comprising a substantiallyconical spring designed to threadably engage into or out ofsaid-opening, and means for compressing said spring into a substantiallyflat plane to clamp said element.

4. A clamping device in combination with an element to be clampedhavingl an opening therethrough, the clamping device comprising asubstantially conical spiral spring designed to threadably extendthrough the opening in said element, and means secured to the tip end ofsaid spiral spring and compressing said spring to clamp said element.

5. A clamping device in combination with an element to be clamped, theclamping device comprising a spiral substantially conically shapedspring, shoulder means against which said spring engages, said springdesigned to threadably engage through the opening in said element untilsaid element rests against said shoulder, and means compressing saidspring to clamp said element.

6. A clamping device in combination with an element to be clamped havingan opening therethrough, the clamping device comprising a spiralsubstantially conical spring, shoulder means against which said springengages, said spring designed to threadably engage through the openingin said element until said element rests upon said shoulder, and meanssecured to the apex of said spring to draw the convolutions thereof intoa substantially flat plane to clamp said element against said shoulder.

'7. A disk holder for use with abrasive disks having a central aperturetherethrough, the holder including a sleeve, a substantially conicalspiral spring, means on the large diameter end of said spring holdingsaid spring rotatable with respect to said sleeve and in proximitythereto, and means secured to the small diameter end of said springextending into said sleve, and means for exerting longitudinal pull onsaid connecting means to compress said spring.

8. A disk holder comprising a sleeve, a conical spiral spring, meanssecuring one end of said spring rotatable with respect to said sleeveand in proximity therewith, connecting means secured to the other end ofsaid spring and extending through said spring and into said sleeve, andmeans secured to said connecting means to exert a longitudinal pullthereupon to compress said spring.

9. A disk holder for use with abrasive disks, said holder including asleeve, a stud threadably engaging within said sleeve, a spiral conicalspring secured at its large diameter end to said sleeve to rotate withrespect thereto, the large diameter end of the spring being held inproximity to said sleeve, a connecting means secured to the-smalldiameter end of said sleeve and to said stud whereby longitudinalmovement of said stud with respect to said sleeve may act to compresssaid spring.

10. A disk holder for use in conjunction with disks having a centralopening therethrough comprising a sleeve, a hollow nipple extending intosaid sleeve, a conical spiral spring threadably engaging said disk sothat said disk may be threaded against the end of said nipple, meansanchoring the large diameter end of said spring within said nipple torotate with respect thereto, a stud threadably engaging into said sleeveand connecting means secured to the small diameter end of said springand-to said stud to compress said spring against said disk.

11. A disk holder for use with disks having an aperture therethroughcomprisingan internally threaded sleeve, a stud threadably engaging saidsleeve and having an end projecting beyond an end of said sleeve, aconicalspiral spring secured at its large diameter end to a connectingmeans extended through said stud from said one end thereof, andprojecting beyond the other end thereof, a spring encircling saidconnecting means between the end thereof and said other end of saidstud, and connecting means secured to said stud and to said smalldiameter end of said spring, said spring being threadably engaged in theopening of the disk until said disk encircles said one end of said stud,longitudinal movement of said stud acting to clamp said spring againstsaid disk.

l2. A disk holder for dental disks having an opening therethrough, saidholder comprising a sleeve internally threaded, a stud engageable withsaid threads to move longitudinally of said sleeve, an end on said studprojecting through said sleeve and beyond one end thereof, a conicalspiral spring secured at its small diameter end to said end on saidstud, and means rotatably securing the large diameter end of said springto said sleeve.

IVAR E. SIQVELAND.

